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tv   [untitled]    August 1, 2010 1:30am-2:00am PST

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treatment redundancy and that would include biosolids, treatment plant improvements, second strategy is to maintain redundancy and that project centers around the channel tunnel for the 66 inch force vain that has failed four times. the next level of service addresses earthquakes. critical dry weather facilities must be online within 72 hours of a major earthquake. this is built around the fact that we have three days worth of dry weather storage in our system. this would enable us to check, inspect, repair and get back online. it will require that we do seismic upgrades at some of our pump stations and increase in
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wet wells. selection system improvements and seismic system upgrades and treatment plant improvements. and the map that we have put together, it highlights all of the locations of all of the different projects, we have upgrades that would be occurring at ocean side, the channel tunnel, which runs from -- north point facility, upgrades at southeast, back flow prevention and the new treasure island plant. so this is a fairly comprehensive list of projects when you think about compliance on this list that makes up about 3.7 to 4.7 billion worth
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of the cost. in 2010 dollars that is 2.2 to 2.7. the reason for doing those projects is maintaining compliance during all conditions, having reliable dry and wet weather treatments, protecting public safety and protecting the bay and ocean and insuring that we have the ability to serve after an earthquake. now perhaps it is the discussion point. what we are looking for as we proceed through the prevention this afternoon in the next two hours is to be able to get agreements on the levels of service so that i can earn this check in my left column on my slide. and we can begin moving forward and locking down goals and levels of service.
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>> if an earthquake were to happen during the dry season, what would be happening during those 72 hours before the facilities got up and running again? >> after an earthquake situation, what we do is that we are doing a full ip spection of all of our major pump stations and lines we have to also have a visual inspection where wewe had a failure after 9 earthquake. we have known vulnerabilities better in areas. controls, seeing if there are
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any other things. power may have knocked out some areas, like the water side. that would require a few days. >> a system to contain it. effectively, this gives us an advantage.
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this is one of great concern. >> i guess what i am getting at is a flip side. we should not be note in a permit violation circumstance during the 72-hour period. >> with the readiness. generators. all of these things have to be part of normal operating procedures to have in place.
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seismically robust. >> during that 72 hours? >> some of the improvements may be equivalent, where there is readiness. and walk around.
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what i need is a check. >> an affirmative nod of the head. >> the commission is happy. we're going to go right into it, and i'm going to change my finder. ok. now, i will move into seven. this is the second.
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section 7 of the presentation. the blue section. ok. our first level of service is control and maintenance of a storm of three-hour duration that delivers 1.3 inches of rain. now, this boutique redesigned storm is expected to occur 20% of the time in any given year. this is the basis of our permit, the operation a permit. the strategy to meet this would be to develop projects, and we will utilize the infrastructure flood control projects which could be any combination of these things.
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in the low impact design. but i will be talking a little bit about what that could look like. the second level would be to manage flows. that is when we are working with other city departments. as landscapes are being redone, but to show leadership in the area, we have to develop design for any dollar spent double impact positively the problems we might have. this is part of the interdepartmental coordination.
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yet another way to be able to impact it. i just want to take a look at a few more things, and then we will go to discussion. there is a low impact design. downspout " disconnection when the annual incentive program where korea $5 million available per year and an incentive program for homeowners and businesses to be able to disconnect their downspouts, use the green cisterns or the buckets to keep storm water out of the collection system. we will be looking at managing the storm water.
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then, we have other projects, in the valley and districts, to mitigate problems. we look at all of the flood control projects, they fall into the flood control section of this charge, and is approximately $2.70 billion. what about the flood control projects? right now, when we have an issue, and rc shui-bian -- and are sick to is overwhelmed -- our situation is overwhelmed, property flooding, currently we have a lot of runoff. this would slow the storm water down and contain it. we could get more experience
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with this to do a better job and be able to -- to be able to use it for beneficial purposes. some of the things are low- lying. this is to be able to mitigate this. .we may have greater intensity is of rain storms. this is a little bit more of a challenging one. but -- our objective within the program is that we use a triple bottom line tool belt -- toolkits -- toosls, but we will
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look at long term, chemicals, going across all of those factors within the confine vote of the watershed. however, the system has to be proven and reliable, and the green infrastructure is an exciting. it is new for us. but in some cases, it will have to be bolstered to make sure we can achieve that. and in our flood control program as we move forward, we will look for some successes. a full watershed analysis. consecutive storms. we also need to determine what the maintenance is.
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this is a deeper subject to we are into. this is how we would perform basically with different levels. and we look deaths of more intense storms. so our existing systems, 1.3 inches, this map shows where the flooding would occur, and the darker areas are more intense flooding. this is up by the creek, lower mission creek. then, let's look at these storms. this is something that i think has to be pointed out. within that three-hour duration,
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there is a variety of intensity. there are a number of different speeds over that little journey, but in this three-hour period, there is a piece that will occur, and the intensities are measured. so if we look at that same system, with a little bit more intensity, the flooding is much wider spread and much more severe, the severe be in the dark blue -- being the dark blue. so what we did was take a look at the areas that are susceptible to flooding, and this is based on the modeling work. some of them are here today who have done this modeling. they go out, and they have a program. they go out there in their rain your -- gear.
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unfortunately, across the city, it does not remain the same in any given location. in one area, you may not get any rain. then we took a look at upgrades. these are included note in the program. what type of flooding would we then see? you can see this would be diminished for the same level of storm. with all of the different flood control projects, the only place we're really seeing an issue is the creek. but it looks quite good over the rest of the city. >> vs. solly? >> what we did is we used a
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percentage -- versus? >> what we did is we used a percentage. i think he could probably give you a quick overview. >> david. there is an assumption that the city is already moving forward with a certain amount of green infrastructure, so that was considered a baseline that we put into the model, and then beyond that, we had specific combinations in projects around the city to solve the problems. our goal was to not focus in on note any individual project or combination of projects but to look about a similar cost. they decided to tweak it slightly differently.
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in terms of what was gray and what was korean, -- green, they were being evaluated, and we used those as a starting point. >> we have the connection, which included structures, and then we had an allowance of approximately 30% of the streets within san francisco, and we spread that out over a period of time. the investment started out at $8 million a year and went up. all of this was spread evenly.
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there are areas where we still see flooding challenges. we still see it the same problems coming back. of the areas we should do being susceptible to flooding, these are the highlighted areas, so we took a lot of kosc -- took a look at the costs. so what if we look at a higher cost?
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actually doubling. it is going to take gray and green, but perhaps you want to spend a minute on this particular side. this is our design. we are challenged in certain areas.
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i will talk to you about what we've looked at so far, and i can proceed in that. >> this will go with the 1.3 inches over three hours. trying to get a fairly small incremental difference. i wanted to make sure that we are not glossing over that. >> we really tried to address
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this. this looked at things at a higher level. >> i would just make a comment. if we buy one level of protection today, it will be less protection tomorrow. >> i think everybody is agreeing that we believe that there will be more intense storms. the issue is it can have couple pitkin -- a couple to go. we can handle that.
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>> when you say handled, what exactly do you mean? is it just going down the sewer? >> now we realize the basis. we see issues where we are having manholes coming up, or there is property damage, but the street has been designed to contain that water. that is part of the design, and what we want to avoid is having in areas where we are always having challenges, and the surrounding area -- we do not want to have that. but --
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>> you are saying it is open? is that you are saying? >> some of the areas are to be challenged where the collection system in diameter or size may be half as big as it needs to be. now, we will look at putting in a bigger pipes it, green infrastructure. some areas are just underserved with what we have got. >> some areas historically workweeks and lakes, so it is not necessarily underserved, but it is a different kind of issue. >> or the cayuga issue we have talked about.
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this causes a problem. >> seeing those more intense storms. >> we look back over our historical data, and we have not seen a change yet in intensity or duration. it looks like it was trekking on note a basis. putting things in different areas. the focus has been consolidation, but our team did
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look at if we had seen any changes, and that is a check will have to do. >> the climate change models are not really finite. much more global. we can take a look at it particularly as relates to the outflows. getting money in congress to build a model of. >> i do not understand what type of investment. i wanted to talk a little bit
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about what we did would korean alternatives. -- green alternatives. we took a look at the management. this map shows the two areas. internally, this is the cayuga area wrote bad experiences flooding.
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downspout disconnection and storm water capture, where reconstructed physical reservoir at a lower elevation so we can capture stormwater before it gets into the system. this is the old reservoir, what that could look like if we use that as a storage basin, so there that is. the rainwater gets in there, and they can play soccer or have a recreational area, but the storm water could be used for beneficial uses.
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so these green improvements within each watershed, we would have additional sources of water that we could use as another form of water re-use. other systems have shown greater improvement of the water quality. it would provide community enhancement, the greening. it slows the water down and gives it another way to go. it is another pathway. a tunnel or infrastructure, eso the types of projects that we will be looking at to solve the


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